Proportioning blowdown water with boiler feed water



C. W. RICE July 19, 1932.

PROPORTIONING BLOWDOWN WATER WITH BOILER FEED WATER Filed Aug. 5, 1927III @ EQE Patented July 19, 1932 PATENT OFFICE CYRUS WILLIAM RICE, OFPITTSBURGH, PENNSYLVANIA PROPORTIONING IBLOWDOWN WATER WITH BOILER FEEDWATER Applicationfiled August ;5, 1927.

The object of this invention is to automatically control or proportionthe flow of blowdown water from a boiler with the flow of feedwater tothe boiler, the means employed constituting a modification of the meansdescribed in an application for patent filed by me June 24, 1927, SerialNo. 201,272.

A further object is to provide a valve responding to variations inpressure in the 19 boiler feeding means, for governing the discharge ofblowdown water from the heat exchanger,this valve being associated witha float controlled valve in an open heater, when such heater is used,but in any event being responsive to variations resulting from thefluctuating demands of the boilers for feed water.

With the foregoing and other objects in view, the invention consists inthe novel con- 29 struction and arrangement of elements described,illustrated and claimed, it being understood that modifications may bemade within the scope of the claims without departing from the spirit ofthe invention. Fig. 1 of the drawing is an elevational view of myblowdown and feed water control apparatus; Fig. 2 is a detail showing ofthe element of Fig. 1; Fig. 3 is a view showing the lever system foroperating the feed water valve 46 of Fig. 1; Fig. 4 is a sectional viewshowing in detail the feed water valve 46 of Fig. 1; Fig. 5 is asectional view showing in detail the blowdown control valve of Fig. 1;and Fig. 6 shows the relation of the. coils 13 to the pipe 18 of Fig. 1.

In the heat exchanger, designated generally by the letter E, the hotblowdown water from a boiler or boilers passes downwardly thru coil 13and thru manifold 18, and thru a pressure regulating device referred tobelow. From this regulating device the blowdown water flows to a pointof discharge.

The relatively cool boiler feed water enters thru pipe 25 and passesthence upwardly thru r casing 15, connected with lower casing element24, and connected also with upper casing element 20. The boiler feedwater thus flowing in a direction around coil 13 opposite to thedirection in which the hot blow- 50 down water flows thru that coil,passes out- Serial No. 210,937.

wardly from upper casing member 20 into pipe 23 leading toward an openheater 40 of standard type.

The water level within this heater 40 is controlled by float 41connected with pivoted 55 arm 42, rod 43, link or the like 44 and stem45 of valve 46. This valve last named is in pipe 47 which pipe 23communicates thru an orifice plate 48 having a port 49 of reduced size.This plate is mounted in a suitable manner, the mounting means beingdesignated generally by the reference character 50, and the plate may bereplaced when desired by another plate having an orifice of increased ordecreased size.

A pipe 54 is connected with pipe 47, and is in communication, at itslower end, with the pressure regulating device referred to below.

The pressure regulating valve may be of standard type and includes avalve element 55 and a diaphragm 56 connected with the valve element bymeans shown conventionally at 57 and influenced by weighted arm 58. Theextent to which this valve opens determines the rate of flow thru thedischarge connection 59 leading from the coil 13 carrying blowdownwater.

The flow of the blowdown water, toward the point of discharge, isproportioned with the fiow of feed water, since the varying pressure inpipe 47 is determined by the operation of valve 46 controlled by float41 in the open heater, this float responding to the conditions producedby variation in water level as the demands of the boiler increase ordiminish. The variation in pressure in the section of pipe 47, betweenorifice plate 48 and valve 46, is manifested within the pipe 54 ofreduced diameter and connected with the pressure chamber on one side ofthe diaphragm 56 of the pressure regulating valve. It is obvious thatany standard type of structure may be employed at the point where thediaphragm controlled device is located. The opening or port 49 inorifice plate 48 is important, with reference to size, and the plate maybe replaced by another, as previously indicated, if no open heater is inuse. In that event, a valve on the boiler would act in the same way asvalve 46 in varying the pressure in pipe 47.

When the concentrations in a boiler are too high or too low, and it isdesired to correct these conditions, the force acting on valve throughlever arm 58 is varied, and the pressure in pipes 47 and 54 increased ordecreased, thereby controllingithe flow of blowdown Water past valve55,"'With a resulting control of the boiler concentrations. Havingdescribed the invention whatis claimed is 1. In anapparatusof the classdescribed,

a boiler feed Water pipe, a pipe for conducting boiler blowdown water toapoint ofdischarge, means to regulate the flow through said last namedpipe for continuously regulating and proportioning the flow ofblowconnection for blowdown water passing from the heat exchangingdevice, a difierential pressure governed valve under variable manualcontrol, for this discharge connection, and a pipe leading from the heatexchanging device for'conveying feedwater partially heated toward aboiler, and having a connection communicating with the difierentialpressure control, v

3, In an apparatus ofthe class described, a heat exchanging deviceincluding a pipe conducting boiler feedwater and a pipe conveying boilerblowdown water, a discharge connection for blowdown water passing fromthe'heat exchanging device, a pressure controlled valve for thisdischarge connection, a pipe leading from the heat exchanging device forconveying feedwater partiallyheated toward a boiler, means for varyingthe pressure in said feed Water pipe including apartition in the feedWater pipe having an orifice of predetermined size and a water levelactuated valve, said valve being arranged to open and close with fallandv rise of a water level, wherein said fall and rise is respectivelyincident to increase and decrease of boiler output; said pressurecontrolled discharge valve being so responsive to variation in pressurein said feed water secondary heating means to said boiler, conduit meansconnecting said primary and secondary heating means, conduit means forsupplying Water to said primary heating means, mechanism automaticallycontrolled by the Water level of said secondary heating means forcontrolling the supply of heating fluid; to: the primary heating means,said mechanism including'a pressure responsive valve in said heatingfluid conduit, thevalve closing. and opening. respectively with increaseand decrease of pressure in the conu t wns s ing; he heate s1 andadjustable means for varying the opening movement of saidvalve.

5. An apparatus comprising the elements of claim 3,- coo perating asthere specified, and aheatericonnected with the feed water pipe andadapted for'connection with a boiler, the valve opening and closingoperation being the result of, change in waterlevel Within the heater 6.A structure c'omprisingthe elements of claim 4, the said mechanismincluding an apertured-partition within the conduit which connects theprimary and secondary heating means, the aperture of. said partitionbeing a reduced port of predetermined size.

In testimony whereof I: aiiix my signature.

' CYRUS WILLIAM RICE.

conveying pipe as to open and close respectively "with decrease andincrease in pressure in sald feed water pipe.

4. In an apparatus of the. class described,

